#include <cstdio>
#define DIM 100050

int a[DIM],n,i,m,b[DIM];
int k;
int main()
{
    freopen("stergeri.in","r",stdin);
    freopen("stergeri.out","w",stdout);
    scanf("%d%d%d\n",&n,&m,&k);
    for( i=1; i<=m; ++i)
       scanf("%d%d\n",&a[i],&b[i]);
    for( i=m; i>=1; --i)
         if(k>=a[i]) k=k+(b[i]-a[i]+1);         
   printf("%d\n",k);
   return 0;
}